converting gsi engine to carb

[MALLY]

is it possible to convert a gsi engine to a single carb off a carb vauxhall engine such as a cavalier or an astra etc? will it run ok??

[m.d.]

yep, this is what i did to my old car, could not be arsed to wire up the injection so i just fitted the 1.4 sr inlet to it (had to have it welded and re machined to stop air leeks on the head) then you have to get an electric fuel pump and there you go, jobs done. mine was quicker than a gsi in carbed form too as the injection is such a massive restriction

[MALLY]

cool im gettin it done then

[m.d.]

besides carbs are much more tuneable to mods than the injection is. so therefore if you change the cam etc you will see more of a gain with a carb

[Snowface]

are you sure a twin choke carb such as a 2e3 from an astra, is going to be better than the EFi on the engine producing 100bhp?

[clawsk]

I agree with snowface, theres no way that doin the above mod will increase your power. If it would then vauxhall wouldnt of bothered with Efi.

Compare sr to sri

Sri's produce 10 more bhp.

[nova_rally]

I agree with snowface, theres no way that doin the above mod will increase your power. If it would then vauxhall wouldnt of bothered with Efi.

Compare sr to sri

Sri's produce 10 more bhp.

And SRis have a totally different head with larger valves. Just have a look at Peugeot engines - theres no power difference between the same engines be they fitted with carb or injection systems.

Injection is only good if it's mappable, otherwise carbs are the best way forward.

Injection only became commonplace because it was possible to up the fuel economy and make the car more driveable in all rev ranges, to do the same on a carb would need something very special indeed.

[m.d.]

thankyou nova-rally

the injection on novas is the worst known to man and if anything makes the car slower.

my standard sr with a gsi engine on a single twin choke was less horsepower but still quicker than any gsi gte that i raced.

it was more resposive and did not have that gay little time delay between when you touched the throttle and when the engine revs.

[Snowface]

so a GTE engine with a 1.6 carb's head and Carb will be quicker?

What if you keep the GTE head and somehow match the manifolds?
Still quicker?

And were talking Pierburg 1b1's and 2e3's are we?

[nova_rally]

Which manifold/head etc did you use. I'm looking into upping to a 1.6 on a Weber 32/34 DMTL if possible in the near future.

I need to change my signature - its a bit wrong now! :wink:

[m.d.]

use the sr one then you have to get a gasget for the gte engine and weld material on in places and port the rest to match the head

it will need re facing due to the welding to fill the gaps

[nova_rally]

great, will be doing that anyway as I'm matching an SR manifold to an SRi head. Good bit of futureproofing there. :D

[jon_boy]

1.2 is more powerful than a 1.2i for example. like said injection only good if it is mappable. twin forties would be a good crack otherwise didnt early fiestas have a DTML carb of some sort on em. cant be that hard to get on a nova manifold surely......

[Snowface]

the 1.2 ismore powerful than the 1.2i only because of the Cat converter on the injection.

And the 1.2 i is Single point injection (not good)
the sri and GTE/GSI is Multi point injection (better).

if you ran mpi on the 1.2 you would see 55-60bhp, same as 1.2 carb.

the 1.3mpi Nova found on the continent is around 75-80bhp i think.

[maxpaine]

i have a friend that put the engine with mecanic fuel pump